Operating fish finder using lithium battery

[Mildog]

Kent I have garmin 10 inch Echo Map with live scope. It draws considerable amperage I’m guessing up to 6 amps possibly. I was using 50 AH LITHIUM and I was draining it to warning shut off level after long day of fishing ( 8-10 hours guessing) I just upgraded to a 150
AH as I’m
Now running 2 10inch units. Only one live scope black box so I don’t expect double amp draw but more than before. (Both the unit and Black box are powered on the live scope)
I used it at Willard the other day only one unit on with live scope for about 6 hours, battery showed 86% remaining.I have Bluetooth monitoring which is great you can check real time and see your amp draw . I used about 21 amps or 3.5 amps per hour ish?
One other thing is several of the companies now make 16 volt and claim better performance and run time not sure if the draw less amps at 16volts? Down side is expense and new charger 16 volt instead of 12 volt lithium life po 4 chargers needed.
Running finders on seperate battery is supposed to get better performance less interference.
Hope that helps!!
Ai says 2.4 amps draw for Helix 9 so rounding up to 2.5 50ah should provide power for 20 hours!
**Pic attached
I’ve used Eco worthy and Li time with good results. I am having an issue with one li time (trolling motor battery one of two) customer service good and they said they will replace battery waiting for a label to return?
Hope that helps